Sodium Bicarbonate → 4-oxo-7-(3-[2-propylphenoxy]propoxy)-4H-1-benzopyran-2-carboxylic acid

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Reaction Steps

A solution of 2.05 parts of ethyl 4-oxo-7-(3-[2-propylphenoxy]-propoxy)- 4H-1-benzopyran-2-carboxylate and 0.46 parts of sodium bicarbonate in 100 parts of 50% v/v aqueous ethanol was stirred on a steam bath for three hours, then cooled and extracted with ether. The aqueous extract was acidified with excess 2N hydrochloric acid to give a white precipitate which was collected, washed with water and dried. Crystallisation of this solid from acetone gave 1.01 parts of 4-oxo-7-(3-[2-propylphenoxy]propoxy)-4H-1-benzopyran-2-carboxylic acid, m.pt. 168°-171°.

Provenance & Evidence